BootBot.js: TypeError: Cannot read property 'forEach' of undefined

tag: needs-investigation

Once in awhile, I get this error in my logs, but I can’t seem to find the cause:

TypeError: Cannot read property 'forEach' of undefined at data.entry.forEach(/app/node_modules/bootbot/lib/BootBot.js:408:24) 

I’ll update if I get it.

[FnTm]

Update: if you only want to stop receiving these errors there is a simple way to do that:

1. Go to you App Settings
2. Messenger -> Settings -> Edit Events (on Webhooks section header) and uncheck standby

No more TypeErrors, which is what I was after in my case.

[FnTm]

@mraaroncruz this is a message that triggered this notice for me:

{ object: 'page',
  entry: 
   [ { id: '1627653683954046',
       time: 1509995621217,
       standby: 
        [ { recipient: { id: '1627653683954046' },
            timestamp: 1509995621217,
            sender: { id: '1193950450705282' },
            postback: { title: 'Nē' } } ] } ] }

The interesting thing here is that everything still works fine, and I can continue the conversation without a problem.

Edit: Looks like it’s something to do with the Handover feature (https://developers.facebook.com/docs/messenger-platform/reference/webhook-events/standby/)